docs(changelog): changelog for lts-v2.8.26 release

Change-Id: I741e12742f65e6e20d74ddab4f91ac5fc44cf8c8
Signed-off-by: Release CI <ci@trustedfirmware.org>
diff --git a/docs/conf.py b/docs/conf.py
index 9f94baa..676ffec 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -14,8 +14,8 @@
 
 project = "Trusted Firmware-A"
 author = "Trusted Firmware-A contributors"
-version = "2.8.25"
-release = "2.8.25"
+version = "2.8.26"
+release = "2.8.26"
 
 # -- General configuration ---------------------------------------------------